"I'm sure, like Phil, that there is an awful lot
less sandeel in the water than there was - hence why the birds are heading off elsewhere to live?
It gets into a bit of a negative feedback loop, apparently. When there are less bait fish, the birds go live somewhere that the living is easier. It seems that oodles of birds, all happily crapping in the sea 24/7/365 provides food for the photoplankton which feed the zooplankton that a lot of the bait fish live off. That cycle appears to have been upset somehow.
As regards the wild VS farmed debate there are many ways to argue the toss. I'll agree that on the face of it, farmed fish sounds like a solution. In theory, a 5lb wild fish should need to have eaten the same amount as a 5lb farmed one. Lets take salmon as the obvious example.
A farmed salmon is reared in a cage at sea. It is fed for most of it's life an artificial fishmeal diet, mainly mackerel, herring, blue whiting and so forth, as I gather. Not the salmon's natural diet. So much so that a couple of weeks prior to slaughter, the salmon have to be fed a dyed food to give that typically pink 'salmon' colour to the flesh, which without this dye would be pretty much white.
So, we're taking from one part of the food web to feed another that would not, in nature, normally happen.
Also, all the food that the salmon fail to snaffle as it sinks through the cages lands on the sea bed below and rots.
Keeping what is not normally a shoal fish in shoaling proximity for extended periods has other side effects - parasites, pollution from fish faeces, a whole raft of diseases.
Some of the drugs/chemicals used to treat these problems are less than environmentally friendly. Take Ivermectin. Lovely stuff. Starts to kill all known crustaceans at a concentration of 4ng/l. To save anyone the math, think about a mouthful in ten thousand olympic swimming pools. Just one of an increasingly lethal cocktail that farmed salmon are treated with - because the parasites are gradually becoming more resistant. They're breeding the better bug. It's well known that salmon farming has decimated sea trout stocks anywhere it's been set up. Worse still, they're usually sited in estuaries where wild salmon and sea trout have to migrate through. Talk about making it easy for the parasites....
And here's the next bit of misinformation that's fed out by fish farmers at every opportunity. We don't use product X to control sea lice. It really doesn't matter that much what they use to kill sea lice. The few chemicals that can be used all act in round about the same ways and the nett effect is to kill or paralyse invertebrates. Lovely for all the marine life for miles around the cages.
Let's go back to the fish food. Like any concentrated material, it's more of what was in the raw material, and we know this is also true of dioxins, pcbs and heavy metals, like mercury, lead, cadmium etc. Wild fish, apex predators in particular (like tuna and swordfish as well as salmon) will naturally concentrate a certain amount of these pollutants, but nothing near the level that a farmed fish will have.
I'm not done with the colourings either. The colourings astaxanthin (E161j) and canthaxanthin (E161g) are used to dye flesh pink, though the permitted concentration of canthaxanthin was reduced by the EU in 2002 due to links with retina damage in humans.
Fish are treated with antibiotics, some of which may remain as residues, and routinely injected with vaccines. The fungicide malachite green (a carcinogen) has been banned. (But traces have since been found in four samples of Scottish salmon and two from Norway since).
Imported farmed fish can be much worse. I remember one case where farmed fish from Chile, I think it was, had been coloured with a fabric dye.
Farmed salmon contain more fat than wild fish. People will tell you that fatty fish is good for you. Yup. In moderation. So if you eat farmed salmon, eat smaller portions than you would wild fish. I often look at the deformed offerings passed off as salmon in supermarkets and note the ever present sign on the wall saying to ""eat 2 portions a week"". I often wonder if the flip side of the sign says ""any more could seriously harm your health - not suitable for children or pregnant or breast-feeding women""....
So, no farmed fish in my house, I'll tell you.
As regards the chicken (I didn't mention battery farmed, although most chicken is), and hell, lets include the sausages, it's all mass produced and the raw material probably was fed on fish meal at some stage, or at least feed enriched with fish oil. You could always have a Quorn burger. :lol:
It's easy to get into a situation where we attack argument or statements as flawed but in fairness, unless you write a whole essay and cover all the bases, somebody can always play devil's advocate and say a statement is flawed, or incomplete or innacurate etc.
I'll agree that a well run fish farm might be the answer to pressure on wild stocks. My problem with the current implementation of fish farms is that they are anything but well run.
There appears to be a very much 'out of sight, out of mind' approach by fish farmers to what they do to the environment around them, the consequences of the diseases and parasites they are fostering seem to not concern them in the least, the siting of the farms could not, in most cases, be worse if you tried. Not feeding farmed fish a 'natural' diet. List goes on....
I'll leave it up to everyone to make up their own mind about fish farming. The internet is loaded with resources you can check up to inform yourself - please, be sceptical of anything I or anyone else writes - research it for yourself. It's just my view, based on what I've read or discussed.
This is as good a place as any to start:
http://www.salmonfarmmonitor.org/"